[root@baber ~]#vi /etc/ntp.conf
# Permit time synchronization with our time source, but do not
# permit the source to query or modify the service on this system.
restrict default kod nomodify notrap nopeer noquery
# Permit all access over the loopback interface. This could
# be tightened as well, but to do so would effect some of
# the administrative functions.
restrict 127.0.0.1
# Hosts on local network are less restricted.
#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
### Edited By Babar Zahoor Jun 16 2009 ###
#server 0.centos.pool.ntp.org
#server 1.centos.pool.ntp.org
#server 2.centos.pool.ntp.org
#broadcast 192.168.1.255 key 42 # broadcast server
#broadcastclient # broadcast client
#broadcast 224.0.1.1 key 42 # multicast server
#multicastclient 224.0.1.1 # multicast client
#manycastserver 239.255.254.254 # manycast server
#manycastclient 239.255.254.254 key 42 # manycast client
# Undisciplined Local Clock. This is a fake driver intended for backup
# and when no outside source of synchronized time is available.
########## for server use this and on clients comment this and use server serverIP ##################
server 127.127.1.0 # local clock
#fudge 127.127.1.0 stratum 10
# Drift file. Put this in a directory which the daemon can write to.
# No symbolic links allowed, either, since the daemon updates the file
# by creating a temporary in the same directory and then rename()'ing
# it to the file.
# driftfile /var/lib/ntp/drift
# Key file containing the keys and key identifiers used when operating
# with symmetric key cryptography.
# Specify the key identifiers which are trusted.
# trustedkey 4 8 42
# Specify the key identifier to use with the ntpdc utility.
# requestkey 8
# Specify the key identifier to use with the ntpq utility.
#controlkey 8
keys /etc/ntp/keys
save quit.
[root@baber ~]#
[root@baber ~]# /etc/init.d/ntpd start
[root@baber ~]# chkconfig --level 235 ntpd on
[root@farrukh ~]# vim ntp.conf
# Permit time synchronization with our time source, but do not
# permit the source to query or modify the service on this system.
restrict default kod nomodify notrap nopeer noquery
# Permit all access over the loopback interface. This could
# be tightened as well, but to do so would effect some of
# the administrative functions.
#restrict 127.0.0.1
#estrict -6 ::1
# Hosts on local network are less restricted.
#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
server 192.168.1.50 ### add this line on second server ###
#server 0.centos.pool.ntp.org
#server 1.centos.pool.ntp.org
#server 2.centos.pool.ntp.org
#broadcast 192.168.1.255 key 42 # broadcast server
#broadcastclient # broadcast client
#broadcast 224.0.1.1 key 42 # multicast server
#multicastclient 224.0.1.1 # multicast client
#manycastserver 239.255.254.254 # manycast server
#manycastclient 239.255.254.254 key 42 # manycast client
# Undisciplined Local Clock. This is a fake driver intended for backup
# and when no outside source of synchronized time is available.
#server 127.127.1.0 # local clock ##### #####
#fudge 127.127.1.0 stratum 10
# Drift file. Put this in a directory which the daemon can write to.
# No symbolic links allowed, either, since the daemon updates the file
# by creating a temporary in the same directory and then rename()'ing
# it to the file.
driftfile /var/lib/ntp/drift
# Key file containing the keys and key identifiers used when operating
# with symmetric key cryptography.
keys /etc/ntp/keys
# Specify the key identifiers which are trusted.
#trustedkey 4 8 42
# Specify the key identifier to use with the ntpdc utility.
#requestkey 8
# Specify the key identifier to use with the ntpq utility.
#controlkey 8
save & exit
[root@farrukh ~]# /etc/init.d/ntpd start
[root@farrukh ~]# chkconfig --level 235 ntpd on
[root@farrukh ~]# ntpdate -u 192.168.1.50
[root@farrukh ~]# watch ntpq -p -n
[root@baber ~]# watch ntpq -p -n

PARTITION SETUP On Both Servers.

Partition setup on both server identical same with fdisk here we have 3GB disks on both servers, here we will setup partition for HA Cluster Servers. We need to create LVM partitions on both machines, we will explain one server named as farrukh.

Install heartbeat package using yum and for installing these packages Internet connection is required or you can configure yum repository on your local machine with extras where the servers / both nodes will be able to found these packages